archangel72

I can't remember when the last time I posted on this thread was, but my Z has not sputtered for a long time. I haven't even thought about it. It might have stopped when I last changed my oil. I went with a sythetic blend from nissan. However, I will state that I used to wait until the engine was warmed up, and thats when it sputtered. I just put it in gear shortly after I start the engine and haven't had that problem...........yes, I'm confused too.

bapestah

I bought Motul at a performance shop in Miami and it didn't last a week on my car -___- I originally thought oil HAD to influence the issue but it's been about 6 oil changes since it began occurring and i've yet to see a change no matter the difference in oil

srsairbags

at this point im soo desparate that ill try anything that i can to see if things change . . i can only assume that things will get better . . .cause my car sputters everyday without fail

D'sNuts

iTrader: (5)

My car was doing this so I reset the tps via manual instructions and it stopped

bardabe

iTrader: (5)

just get your car tunned, and have the Cam Phasing disabled until its at operating temp. it's not like you are going to drive your car hard when it's cold right? so power loss wont be aparent, no sputter problem solved. it's not hard guys.

stylett9

iTrader: (9)

Mine's been sputtering for over 3 years now. So far no noticeable signs of major damage.

srsairbags

have you looked at your spark plugs ? would sputtering foul plugs ?

FastGreg

Dear All,

Could you please have a look on the following web page with Google translator:

http://oppama-garage.jp/maintenance_..._20070408.html

http://translate.google.fr/translate..._20070408.html

So, what do you think about it ?

srsairbags

goodness . . awesome find fastgreg . . . i couldnt go through the whole page, but this is further proof that the VCT system is causing the sputter and the engine oil could be the culprit here . . but i couldnt make much out at the end . . is the article asking us to go thinner than 5w30 ? . . any suggestions ? ?

FastGreg

No, as I understand, 5W30 only, they do several test with 5w30 oils.

http://translate.google.com/translat..._20070912.html

And this is the oil recommended by Nissan for the VQ35HR:

oil_keep_200903.pdf

But... Nismo just issued an Ester oil made by Motul for the VQ35HR which is an 0w30 oil...

Nismo%20Competition%20Oil%202108E%200W30_GB[1].pdf

So...

Currently, I run with the Motul 300V 5w40, and with sputtering...

My ECU has been tuned, I changed my spark plugs last Sunday, cleaned the MAF, the throttlle bodies, and it is still sputtering !

Previously I changed the O2 sensors.

Still no DTC !

Next level: 5w30 300V oil...

srsairbags

ok, feels good that we have pretty much nailed it down to oil . .and VCT of course

Im gonna try the redline 5w30 ester oil (i cant get Motul anywhere nearby) . . . although im pretty sure it will still sputter . . i wanna give it a shot . . do let us know what happens to your sputtering after Motul 300v

FastGreg

Don't forget to change your oil filter in the same time, as I understand the issue come form the viscosity of the oil at 80°C, which occur a wrong work of the solenoid (VTC) regarding the informations sent by the ECM, if not 5W30...

srsairbags

k&n wrench-off oil filter from now on . . last time i use Mobil1 oil filter and while taking it off , part of my hands skin came off ( in the inside of the nylon glove) . . . ridiculous

Z+Lotus+Vette

I can't believe this has not been settled in 31 pages and 4 years!

I plan to try the original suggestion of DryGas, since at my most recent fill-up the pump ran veerry slowly, indicative of the stations tank being very low. Probably got a bad tank of gas.

I had the bucking so bad that I could only creep around in "D"...any application of gas threatened stalling.

I did the "Microsoft", and shut off the car and turned back on. This allowed me to get out of the lot and start driving, but the problem recurred as a stutter at the first traffic light.

Additionally, it was cold and raining today, so I turned the key very quickly and immediately. After some questionable starts a month ago, I have been allowing the fuel pump to "prime/pressurize", by pausing in the "ON" position before going on to "START". This is the first time I have not followed this procedure since then.
(Lotus cars require such a pause, or they have a very rough and stumbly start.)

I almost drove it straight to Nissan, glad I checked here first.
"Can not duplicate" is the most common diagnosis I have ever gotten from mechanics. Diagnosis is a lost art.

srsairbags

i am afraid you are having an unrelated issue with similar symptoms . . . this issue is specific to 07-08 350zs (HRs)

FastGreg

So, today I swapped my oil with 300V 5W30, and guess what... STILL SPUTTERING, but less I feel...

Previously I runned with 300V 5W40.

I will keep posted after few more start !

srsairbags

i think it will gradually stop doing it

FastGreg

New cold start yesterday, no sputtering...

After several starts I will be able to provide you with a consistant feed-back.

I already order some Castrol Edge Sport 0W40 for a last oil trial !

But it seems that the issue really come from the motor oil...

midz350

iTrader: (4)

It's not the oil guys.

FastGreg

What do you think about Midz ?